Revert "nixos: add option for bind to not resolve local queries (#29503)"

This reverts commit 670b4e29ad. The change
added in this commit was controversial when it was originally suggested
in https://github.com/NixOS/nixpkgs/pull/29205. Then that PR was closed
and a new one opened, https://github.com/NixOS/nixpkgs/pull/29503,
effectively circumventing the review process. I don't agree with this
modification. Adding an option 'resolveLocalQueries' to tell the locally
running name server that it should resolve local DNS queries feels
outright nuts. I agree that the current state is unsatisfactory and that
it should be improved, but this is not the right way.

nixos/modules/config/networking.nix

@@ -9,9 +9,7 @@ let
   cfg = config.networking;
   dnsmasqResolve = config.services.dnsmasq.enable &&
                    config.services.dnsmasq.resolveLocalQueries;
-  bindResolve =    config.services.bind.enable &&
-                   config.services.bind.resolveLocalQueries;
-  hasLocalResolver = bindResolve || dnsmasqResolve;
+  hasLocalResolver = config.services.bind.enable || dnsmasqResolve;
 
   resolvconfOptions = cfg.resolvconfOptions
     ++ optional cfg.dnsSingleRequest "single-request"

nixos/modules/services/networking/bind.nix

@@ -151,15 +151,6 @@ in
         ";
       };
 
-      resolveLocalQueries = mkOption {
-        type = types.bool;
-        default = true;
-        description = ''
-          Whether bind should resolve local queries (i.e. add 127.0.0.1 to
-          /etc/resolv.conf, overriding networking.nameserver).
-        '';
-      };
-
     };
 
   };

nixos/modules/services/networking/dnsmasq.nix

@@ -42,7 +42,7 @@ in
         default = true;
         description = ''
           Whether dnsmasq should resolve local queries (i.e. add 127.0.0.1 to
-          /etc/resolv.conf overriding networking.nameservers).
+          /etc/resolv.conf).
         '';
       };
 

nixos/modules/tasks/network-interfaces-scripted.nix

@@ -105,7 +105,7 @@ let
               ''
                 # Set the static DNS configuration, if given.
                 ${pkgs.openresolv}/sbin/resolvconf -m 1 -a static <<EOF
-                ${optionalString (cfg.domain != null) ''
+                ${optionalString (cfg.nameservers != [] && cfg.domain != null) ''
                   domain ${cfg.domain}
                 ''}
                 ${optionalString (cfg.search != []) ("search " + concatStringsSep " " cfg.search)}